Confirmed: you can restore 4.2.2 base rom backups after you've Odin flashed the 4.4 kk update with the new bootloader...just an FYI as I've been able to successfully restore back and forth between 4.2 and 4.4 base roms

Mega

Is it for galaxy s4 I9505 also?
And what if I flashed using cwm instead of odin flash?
And can I restore my 4.2.2 stock(rooted) backup also?

I've only used stock and the FlexNote 4.4.2 ROM from @civato since upgrading to KitKat but I think some users have experienced issues with charging when the 4.4.2 bootloader is installed in combination with a 4.2.x ROM.

I've only used stock and the FlexNote 4.4.2 ROM from @civato since upgrading to KitKat but I think some users have experienced issues with charging when the 4.4.2 bootloader is installed in combination with a 4.2.x ROM.

The 4.2.x ROM still works but there may be a few glitches elsewhere.

ramjet73

Sure there's always gonna be oddities when mixing any systems...but I upgraded via odin to 4.4 and restored 4.2 the day I posted this comfirming downgrade is possible months ago and have stayed on my 4.2 firenote rom with 4.4 bootloader since without issue so sure with anything your mileage may vary depending in your device but that's always the case on any of the 12 devices I build roms for

XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality.Are you a developer?